[PATCH 1/6] ARM: sa1100: switch to MULTI_IRQ_HANDLER

[dbaryshkov@gmail.com (Dmitry Eremin-Solenikov)]

Add sa1100_handle_irq implementating handle_irq for sa1100 platform.
It is more or less a translation of old assembly code from assembler to
plain C. Also install this irq handler from sa1100_init_irq().

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
---
 arch/arm/Kconfig           |  1 +
 arch/arm/mach-sa1100/irq.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 89c4b5c..2f3f132 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -703,6 +703,7 @@ config ARCH_SA1100
 	select GENERIC_CLOCKEVENTS
 	select HAVE_IDE
 	select ISA
+	select MULTI_IRQ_HANDLER
 	select NEED_MACH_MEMORY_H
 	select SPARSE_IRQ
 	help
diff --git a/arch/arm/mach-sa1100/irq.c b/arch/arm/mach-sa1100/irq.c
index 2124f1fc..9a3bdf1 100644
--- a/arch/arm/mach-sa1100/irq.c
+++ b/arch/arm/mach-sa1100/irq.c
@@ -20,6 +20,7 @@
 #include <mach/hardware.h>
 #include <mach/irqs.h>
 #include <asm/mach/irq.h>
+#include <asm/exception.h>
 
 #include "generic.h"
 
@@ -291,6 +292,23 @@ static int __init sa1100irq_init_devicefs(void)
 
 device_initcall(sa1100irq_init_devicefs);
 
+static asmlinkage void __exception_irq_entry
+sa1100_handle_irq(struct pt_regs *regs)
+{
+	uint32_t icip, icmr, mask;
+
+	do {
+		icip = (ICIP);
+		icmr = (ICMR);
+		mask = icip & icmr;
+
+		if (mask == 0)
+			break;
+
+		handle_IRQ(ffs(mask) - 1, regs);
+	} while (1);
+}
+
 void __init sa1100_init_irq(void)
 {
 	unsigned int irq;
@@ -338,5 +356,7 @@ void __init sa1100_init_irq(void)
 	irq_set_chip(IRQ_GPIO11_27, &sa1100_normal_chip);
 	irq_set_chained_handler(IRQ_GPIO11_27, sa1100_high_gpio_handler);
 
+	set_handle_irq(sa1100_handle_irq);
+
 	sa1100_init_gpio();
 }
-- 
2.1.1